<template>
  <div id="home">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control class="tab-control" v-show="isTabFixed"
                :titles="['流行','新款','精选']" 
                @tabClick="tabClick" 
                ref="tabControl1" />
    <scroll class="content" 
            ref="scroll" 
            :probe-type="3" 
            @scroll="contentScroll" 
            :pull-up-load="true"
            @pullingUp="loadMore">
          <home-swiper :banners = "banners" @swiperImageLoad="swiperImageLoad"/>
          <recommend-view :recommends="recommends" />
          <feature-view/>
          <tab-control class="tab-control" 
            :titles="['流行','新款','精选']" 
            @tabClick="tabClick" 
            ref="tabControl2" />
          <good-list :goods="showGoods"/>
    </scroll>

      <back-top @click.native="backClick" v-show="isShowBackTop"/>
  </div>
</template>

<script>
//公共组件的导入
import HomeSwiper from "./childeComps/HomeSwiper"
import RecommendView from './childeComps/RecommendView'
import FeatureView from './childeComps/FeatureView'


import NavBar from "components/common/navbar/NavBar"
import TabControl from "components/content/tabControl/TabControl"
import GoodList from "components/content/goods/GoodsList"
import Scroll from "components/common/scroll/Scroll"
import BackTop from "components/content/backTop/BackTop"


import {getHomeMultidata,getHomeGoods} from "network/home"
import {debounce} from "../../common/utils";




export default {
  name:"Home",
  components:{
    NavBar,
    HomeSwiper,
    RecommendView,
    FeatureView,
    TabControl,
    GoodList,
    Scroll,
    BackTop,
  },
  data(){
    return {
      banners:[],
      recommends:[],
      goods:{
        'pop':{page: 0, list:[]},
        'new':{page: 0, list:[]},
        'sell':{page: 0, list:[]},
      },
      currentType:'pop',
      isShowBackTop: false,
      tabOffsetTop: 0,
      isTabFixed:false
    }
  },
  computed:{
      showGoods(){
        return this.goods[this.currentType].list
      }
  },
  destroyed(){
    console.log("home destroyed");
  },
  activated(){
    this.$refs.scroll.scrollTo(0, this.saveY, 0)
    this.$refs.scroll.refresh()
  },
  deactivated(){
    this.saveY = this.$refs.scroll.getScrollY()
  },
  created(){
    //1请求多个数据
    this.getHomeMultidata()
    //2请求商品数据
    this.getHomeGoods('pop')
    this.getHomeGoods('new')
    this.getHomeGoods('sell')

},
  mounted(){
    //监听item中图片加载完成
    const refresh = debounce(this.$refs.scroll.refresh,200)
    this.$bus.$on('itemImageLoad', () => {
      refresh()
      // this.$refs.scroll.refresh() 
    })

  },
  methods:{
    /**
     *  事件监听相关的方法
     */

      tabClick(index){
        switch(index){
          case 0:
            this.currentType = 'pop'
            break
          case 1:
            this.currentType = 'new'
            break
          case 2:
            this.currentType = 'sell'
            break
        }
        this.$refs.tabControl1.currentIndex = index;
        this.$refs.tabControl2.currentIndex = index;
      },
      backClick(){
          // this.$refs.scroll.scroll.scrollTo(0, 0, 500)
          this.$refs.scroll.scrollTo(0, 0)
      },
      contentScroll(position){
        //判断BackTop是否显示
        this.isShowBackTop = (-position.y) > 1000

        //决定tabControl是否吸顶(position:fixed)
        this.isTabFixed = (-position.y) > this.tabOffsetTop
      },
      loadMore(){
        
        this.getHomeGoods(this.currentType)
      },

      swiperImageLoad(){
        // console.log(this.$refs.tabControl.$el.offsetTop);
        
        this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
      },
    /**
     * 网络请求相关的方法
     * */
    getHomeMultidata(){
      getHomeMultidata().then(res => {
        this.banners = res.data.data.banner.list;
        this.recommends = res.data.data.recommend.list;
      })
    },
    getHomeGoods(type){
    const page = this.goods[type].page + 1
    getHomeGoods(type,page).then(res =>{
      this.goods[type].list.push(...res.data.data.list)
      this.goods[type].page += 1                                          
      //完成上拉加载更多
      this.$refs.scroll.finishPullUp()
      })
    },
  }
}

</script>

<style scoped>
  #home{
    /* padding-top:44px; */
    height: 100vh;
    position:relative
  }

  .home-nav{
    background-color:var(--color-tint);
    color:#fff;
  
    /* position:fixed;
    left: 0;
    right: 0;
    top: 0; 
    z-index: 9;*/
  }

  .tab-control{
    position: relative;
    background-color: #fff;
    z-index: 9;
  }

  .content{
    overflow: hidden;
    position: absolute;
    top:44px;
    bottom:49px;
    left: 0;
    right: 0;
  }

  /* .content{
    height:calc(100% - 93px);
    overflow: hidden;
    margin-top: 44px;
  } */
</style>